Porpoises have the highest known upper hearing limit at around 160 kHz. Toothed whales, including dolphins, can hear ultrasound and use such sounds in their navigational system ( biosonar) to orient and to capture prey. The frequency of most dog whistles is within the range of 23 to 54 kHz. A dog whistle is a whistle that emits ultrasound, used for training and calling dogs. The wild ancestors of cats and dogs evolved this higher hearing range to hear high-frequency sounds made by their preferred prey, small rodents. ĭogs and cats' hearing range extends into the ultrasound the top end of a dog's hearing range is about 45 kHz, while a cat's is 64 kHz. Tiger moths also emit clicks which may disturb bats' echolocation, and in other cases may advertise the fact that they are poisonous by emitting sound. Ultrasonic frequencies trigger a reflex action in the noctuid moth that causes it to drop slightly in its flight to evade attack. Upon hearing a bat, some insects will make evasive manoeuvres to escape being caught. These include many groups of moths, beetles, praying mantids and lacewings. Many insects have good ultrasonic hearing, and most of these are nocturnal insects listening for echolocating bats. They can detect frequencies beyond 100 kHz, possibly up to 200 kHz. A dog whistle, a whistle which emits sound in the ultrasonic range, used to train dogs and other animalsīats use a variety of ultrasonic ranging ( echolocation) techniques to detect their prey.

Ultrasound vs sonogram